弯曲窄槽型河段多线船闸通航水流条件研究

当船闸下游引航道口门区位于河道的弯曲窄槽段时,由于河道水深较浅、通航水流条件非常复杂,不利于通航。依托京南枢纽二线船闸工程,采用1∶100整体物理模型,对弯曲窄槽型河段多线船闸通航水流条件开展系列试验研究。结果表明:1)原枢纽平面布置方案存在缺陷,下游引航道口门区水流条件易受弯道顶冲水流的影响,弯道处断面束窄导致流速较大。2)同时隔流堤高程太低,会引起水流翻过隔流堤产生混乱水流的现象。提出改进措施:1)上游隔流堤高程应加高至33.46 m,下游隔流堤高程应加高至32.58 m。2)推荐增设隔流墙、调顺岸线,同时开挖河床等。研究方案为京南枢纽二线船闸工程通航水流条件改善提供了技术支持。

Study on navigable flow conditions of multi-lane lock in curved narrow channel section

When the downstream navigable entrance area is located in a curved narrow channel section,the water depth of the river is relatively shallow and the navigational flow conditions are very complicated,which is not conducive to navigation. Relying on the second-line ship lock project of Jingnan junction,a series of experimental studies have been carried out on the navigational flow conditions of the multi-lane lock in the curved narrow channel using a 1: 100 overall physical model. The results show that: 1) The original junction layout plan has defects. The water flow conditions at the entrance of the downstream approach channel are easily affected by the water flow at the top of the bend,and the narrow cross-section leads to larger flow velocity. 2) At the same time,the separation dike’s elevation is so low that it will cause water flow to overturn the separation dike and produce chaotic flow. The following improvement measures are proposed: 1) The elevation of the upstream separation dike should be increased to 33. 46 m and the elevation of the downstream separation dike should be increased to 32. 58 m. 2) It is recommended to add a partition wall,smoothen the shoreline,and excavate the riverbed. The research plan provides technical support for improving the navigable flow conditions of the second-line ship lock project of the Jingnan junction.